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Old 01-07-2015, 11:10 PM   #1
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How to find age of tires

I am going to go look at a Chieftain 23 footer, that I think I will likely purchase., How can I tell the age of the tires on it.
If the tires are old, I will need to plan for replacement, and use it to figure a price.


Thanks for your help
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Old 01-07-2015, 11:25 PM   #2
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On the tire sidewall you'll see a DOT code number. The last 4 digits stand for the week and year. If the last 4 digits were 3408, the tire was made the 34th week of 2008.
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Old 01-07-2015, 11:39 PM   #3
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Thank you.
Anyone know what size tire a 89 winnebago chieftain 23" uses???
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Old 01-07-2015, 11:58 PM   #4
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Check for a Federal required sticker to the left of the driver's seat that should contain that information. Also, Winnebago has great documentation on all of there models through the years.

Manuals & Diagrams
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Old 01-08-2015, 07:43 AM   #5
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An '89 Winnie almost surely has 16" tires, but the width is an unknown (to me).

I don't think the federal sticker was around in 1989 either.
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Old 01-08-2015, 08:32 AM   #6
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Originally Posted by BFlinn181 View Post
On the tire sidewall you'll see a DOT code number. The last 4 digits stand for the week and year. If the last 4 digits were 3408, the tire was made the 34th week of 2008.
The above formula only works for tires made in the year 2000 or later. Tires made from about 1970 to 1999 only have a 3 digit code identifying the week and year the tires were made. Since tires weren't expected to last more than 10 years the identifying numbers are somewhat cryptic. The code 249 would indicate the tires were made in the 24th week of the 9th year in the decade. Which decade isn't specified.

At this point identifying the decade prior to 2000 that the tires were built is pretty much a Mute point. Anything with a 3 digit code would be over 15 years old and should be replaced

Here's a link showing what the numbers look like and where to find them.
How to Find Out How Old Your Tires Are - Popular Mechanics
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Old 01-08-2015, 12:39 PM   #7
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If you don't see the date code, get under the coach and look on other side of tire.
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Old 01-08-2015, 12:50 PM   #8
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Gary, Thanks, I can't find anything about the proper tire size, for the Chieftain of any length
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Old 01-08-2015, 01:35 PM   #9
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Thank you.
Anyone know what size tire a 89 winnebago chieftain 23" uses???
The best I can tell they came with 7.50 X 16 bias ply tires. Here's a link to the 1989 Chieftain brochure from Winnebago.

http://www.winnebagoind.com/products...eftain-bro.pdf

It doesn't give the tire size, but does say radial tires are an option. Here's a link to some Chevrolet chassis information of the same era.

http://www.offroadtoybox.com/RV/P-Ch...entProcess.pdf
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Old 01-08-2015, 01:36 PM   #10
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In the brochure for a 1989 Chieftain 23' Class A RV, it states that it's on a Chevy chassis. That would be a P Chassis, with a 454 cu engine.

http://www.winnebagoind.com/products...eftain-bro.pdf

This link shows that it should have 7.5" x 16" tires.

http://www.offroadtoybox.com/RV/P-Ch...entProcess.pdf

(pgs 12 -13)

Wow, like minds think alike!!
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Old 01-08-2015, 02:20 PM   #11
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Thanks guys, that is a big help.
Much appreciated!!!
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Old 01-08-2015, 02:34 PM   #12
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Got an email back from rom Winnebago
Click image for larger version

Name:	Screen Shot 2015-01-08 at 3.29.52 PM.png
Views:	43
Size:	26.7 KB
ID:	82965
7.50 x 16

That is why I am looking at Winnebago...
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Old 01-08-2015, 03:52 PM   #13
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Quote:
Originally Posted by BFlinn181 View Post
On the tire sidewall you'll see a DOT code number. The last 4 digits stand for the week and year. If the last 4 digits were 3408, the tire was made the 34th week of 2008.
And if they're really old and made before 2000, there will only be 3 digits, as in 199 would be the 19th week of 1999.
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Old 01-08-2015, 05:19 PM   #14
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And if they're really old and made before 2000, there will only be 3 digits, as in 199 would be the 19th week of 1999.
You're incorrect on the reading of your code example. The code was mandated beginning in 1980. A DOT code of 199 would be the 19th week of 1989. A code of 337 would mean 33rd week of 1987. From 1990-1999 the three digit code was followed by a triangle(Δ) symbol to show it was the 9th decade of the century so it wouldn't be confused with the previous decade. The DOT code for a tire made in the 19th week of 199 would be marked 199Δ.

If you find a 3 digit code, with or without the Δ, the tire is too old to safely run. That's why I didn't mention the older code system. If you find a 3 digit code, it's a tire made prior to 2000 and has been around at least 14 years old.
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